my vga just uses my monitor and no the computer
but if you are trying to say that you unhooked your monitor from your computer and then hooked it back up and now have a problem i think that I can help you.
first boot your computer in safe modes with the f8, then try and reinstall your geforce drivers, if that doesn't work then uninstall your geforce driver then reinstall.
if anyone else as an idea or agreement please post
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